<template>
  <Header></Header>
  <div class="courseContainer">
    <div class="courseInfoTop">
      <div class="info-container">
        <ul class="route">
          <li class="route-item" style="cursor: pointer">
            <router-link to="/course" style="color: #fff">课程</router-link>
          </li>
          <li class="route-item"><i class="el-icon-arrow-right"></i></li>
          <li class="route-item" style="cursor: pointer">
            {{courseInfo.discountPrice === 0 ? '免费课' : '会员课程'}}
          </li>
          <li class="route-item"><i class="el-icon-arrow-right"></i></li>
          <li class="route-item">{{courseInfo.courseName}}</li>
        </ul>
        <div class="name">{{ courseInfo.courseName }}</div>
        <div class="info">
          <div class="Avat">
            <img src="../assets/img/Avat62.png" alt=""/>
          </div>
          <ul class="teacherName">
            <li class="name-item">
              {{ courseInfo.courseName }}
              <img src="../assets/img/teacherStart.png" alt=""/>
            </li>
            <li class="name-item">金牌讲师</li>
          </ul>
          <ul class="access">
            <li class="access-item">难度</li>
            <li class="access-item">{{ courseTypeFn(courseInfo.courseLevel) }}</li>
            <li class="access-item">·</li>
            <li class="access-item">时长</li>
            <li class="access-item">{{courseInfo.totalHour}}个小时</li>
            <li class="access-item">·</li>
            <li class="access-item">学习人数</li>
            <li class="access-item">{{courseInfo.purchaseCounter + courseInfo.purchaseCnt}}人</li>
            <li class="access-item">·</li>
            <li class="access-item">综合评分</li>
            <li class="access-item">10.00</li>
          </ul>
        </div>
      </div>
    </div>

    <div class="info-nav">
      <div class="nav-container">
        <div class="chapter-item" @click="activeChange=true ">
          <div :class=" activeChange ? 'active1':''">章节</div>
          <div class="line" :class="activeChange ? 'active2':''"></div>
        </div>
        <div class="chapter-item" @click="activeChange=false">
          <div :class="!activeChange ? 'active1':''">下载资料</div>
          <div class="line" :class="!activeChange ? 'active2':''"></div>
        </div>
      </div>
    </div>
    <div class="course" v-if="activeChange">
      <div class="main">
        <div class="introduction">
          <div class="desc">
            好好学习，天天向上！哈哈哈
          </div>
          <div class="btn">
            <button class="btn-item active">立即购买</button>
            <button class="btn-item">加入购物车</button>
          </div>
        </div>
        <div class="video" v-for="item in courseChapters" :key="item.id">
          <div class="chapterName">{{ item.chapterName }}</div>
          <div class="chapterDesc">{{ item.description }}</div>
          <ul class="videos">
            <li class="video-item" v-for="k in item.children" :key="k.id">
              <div class="video-itemIcon">
                <i class="el-icon-video-camera"></i>
              </div>

              <div class="item-name">
                <span class="shipin">视频：</span>
                <span class="chapterName">{{ k.chapterName }}</span>
                <span class="free">试看</span>
              </div>
              <button class="btn-learn">开始学习</button>
              <div class="clearfloat"></div>
            </li>
          </ul>
        </div>
      </div>
    </div>
    <div v-else>
      <div v-if='attachments.length > 0'>
        <div class="down" v-for='item in attachments' :key='item.id'>
          <div class="source">
            <span class="downloadCourse">{{ item.attachmentName }}</span>
            <button class="downloadbtn" @click="downloadSource(item)">下载资料</button>
          </div>
        </div>
      </div>
      <div v-else>
        <el-empty
            description="该课程暂无资料"
        ></el-empty>
      </div>
    </div>
  </div>
  <Foot></Foot>
</template>

<script setup>
//组件
import Header from '../components/common/Header.vue'
import Foot from '../components/common/Foot.vue'
// element-plus
import {ElMessage} from 'element-plus';
//mixin
import mixin from '../mixins/courseType.js'
let { courseTypeFn } = mixin();
//api
import { getCourseDetail, courseCheckAuth, downloadAttachment } from '../utils/api/courseManage'
//pinia
import { useUserStore } from '@/store/user'
let router = useRouter();

// 路由对象
let route = useRoute()
// console.log(route.params.id)
// 课程 id
let courseId = route.params.id
// 课程详情数据
let courseInfo = ref({})
// 课程章节数据
let courseChapters = ref([]);
//课程资料
let attachments = ref([]);

onBeforeMount(()=>{
  getCourseDetail({courseId}).then(res => {
    // console.log(res.data.data)
    courseInfo.value = res.data.data
    courseChapters.value = res.data.data.bizCourseChapters;
    attachments.value = res.data.data.bizCourseAttachments;
  })
})

// 切换课程和资料
let activeChange = ref(true)
// 判断资料是否存在
let download = ref(true)

// 下载资料
const downloadSource = (item) =>{
  if( !useUserStore().token ){
    ElMessage.info({
      message: '请先登录'
    });
    router.push('/login');
    return ;
  }
  // 如果是登录状态
  courseCheckAuth({courseId: item.courseId}).then(res => {
    // console.log(res)
    // 如果没有权限，提醒购买
    if(!res.data.data.hasAuth){
      ElMessage.info({
        message: '请您购买该课程才可以下载资料！'
      });
      return
    }
    // 有权限
    downloadAttachment({
      courseId: item.courseId,
      attachmentId: item.id
    }).then(res => {
      // console.log(res)
      const blob = new Blob([res]);
      let fileName = item.attachmentName;
      let fileUrl = item.attachmentUrl;
      const extName = fileUrl.substring(
          fileUrl.lastIndexOf('.')
      )
      fileName = fileName + extName;
      const link = document.createElement('a');
      link.download = fileName;
      link.target = '_blank';
      link.style.display = 'none';
      link.href = URL.createObjectURL(blob);
      document.body.appendChild(link);
      link.click();
      URL.revokeObjectURL(link.href);
      document.body.removeChild(link);
    })
  })
}

</script>

<style scoped>
.courseContainer {
  width: 100%;
  height: 100%;
  background: #f8fafc;
  overflow: hidden;
}

.main {
  margin: 40px auto;
  width: 1200px;
  height: 100%;
}

.courseInfoTop {
  width: 100%;
  height: 200px;
  background-image: url("../assets/img/courseInfobg1920.png");
}

.nav-container {
  width: 1200px;
  margin: 0 auto;
  color: #333333;
  display: flex;
}

/* .chapter-item  .active{
    color: #388FFF;

} */
/* 背景部分开始 */
.courseInfoTop .info-container {
  margin: 0 auto;
  width: 1200px;
  height: 200px;
  color: #ffffff;
  z-index: 5;
}

.route {
  /*margin-left: 50px;*/
  padding-top: 20px;
  display: flex;
  font-size: 14px;
}

.route .route-item {
  margin-right: 10px;
}

.name {
  margin: 30px 0 10px 0px;
  font-size: 24px;
}

.info {
  display: flex;
  /*margin-left: 50px;*/
}

.info .Avat {
  width: 60px;
  height: 60px;
  border-radius: 50%;
}

.info .Avat img {
  width: 100%;
  height: 100%;
  border-radius: 50%;
}

.teacherName {
  margin: 8px 0 0 8px;
}

.name-item img {
  width: 14px;
  height: 14px;
}

.access {
  margin: 0 0 0 100px;
  display: flex;
}

.access .access-item {
  margin-right: 10px;
  line-height: 60px;
}

/* 背景部分结束 */

/* 导航栏开始 */
.info-nav {
  width: 100%;

  background: #ffffff;
  box-shadow: 0px 3px 6px rgba(0, 0, 0, 0.16);
}

.course {
  margin: 0 auto;
  width: 1200px;
}

.chapter {
  display: flex;
  font-weight: 600;
  color: #333333;
  margin-left: 50px;
  font-size: 20px;
}

.chapter-item {
  padding-bottom: 8px;
  font-size: 20px;
  font-weight: bold;
  line-height: 80px;
  margin-right: 70px;
  cursor: pointer;
  position: relative;
}

.chapter-item .active1 {
  color: #388fff;
}

.chapter-item .active2 {
  position: absolute;
  width: 70%;
  top: 63px;
  left: calc(30% / 2);
  height: 4px;
  background: #388fff;
  border-radius: 2px;
}

/* 导航栏结束 */
/* 课程介绍开始 */
.introduction {
  /*margin-left: 50px;*/
  /*padding: 20px;*/
  width: 1210px;
  background: #ffffff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0px 3px 6px rgba(0, 0, 0, 0.09);
}

.desc {
  padding: 20px;
  color: #474747;
  line-height: 35px;
}

.btn {
  float: right;
  margin-top: 10px;
  padding: 0 20px 20px;
}

.btn-item {
  width: 120px;
  height: 40px;
  /*margin: 0 20px 0 0;*/
  padding: 0px;
  border: 0px;
  outline: none;
  color: #f11d1d;
  border-radius: 23px;
  cursor: pointer;
}

.btn .active {
  background: #f11d1d !important;
  color: #ffffff;
  margin-right: 10px;
}

/* 课程介绍结束 */

/* 视频目录开始 */
.video {
  margin: 20px 0;
  padding: 20px;
  width: 1170px;
  background: #ffffff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0px 3px 6px rgba(0, 0, 0, 0.09);
}

.video .chapterName {
  font-weight: bold;
  font-size: 20px;
  color: #333333;
}

.video .free {
  padding-left: 20px;
  font-size: 14px;
  color: #388fff;
}

.chapterDesc {
  margin: 10px 0;
  font-size: 13px;
  color: #5c5c5c;
}

.video-item {
  height: 40px;
  line-height: 40px;
  padding: 5px 0;
  /*margin: 0 0 10px 0;*/
  border-radius: 8px;
}

.video-item:hover {
  cursor: pointer;
  background: rgba(53, 133, 255, 0.2);
  border-radius: 8px;
  color: #388fff !important;
}

.video-item .shipin {
  color: #333333;
  font-weight: bold;
}

.video-item .chapterName {
  font-size: 16px;
  font-weight: 400;
  color: #333333;
}

.video-itemIcon,
.item-name {
  float: left;
  padding-left: 10px;
}

.btn-learn {
  margin: 5px 5px 0 0;
  float: right;
  right: -100px;
  width: 80px;
  height: 30px;
  line-height: 30px;
  border: 0px;
  outline: none;
  color: #fff;
  background: #388fff;
  border-radius: 12px;
  cursor: pointer;
}

.clearfloat {
  clear: both;
}

/* 视频目录结束 */
.source {
  margin: 2px 0;
  padding: 5px;
  display: flex;
  justify-content: space-between;
  box-shadow: 0px 3px 6px rgba(0, 0, 0, 0.09);
}

.down {
  margin: 10px auto !important;
  width: 1200px;
  height: 100%;
  padding: 5px;
  background: #ffffff;
  box-sizing: border-box;
  border-radius: 8px;
}

.down:first-child {
  margin: 40px 0 5px 0;
}

.downloadbtn {
  width: 100px;
  height: 30px;
  line-height: 30px;
  background: #388fff;
  border: none;
  border-radius: 8px;
  color: #fff;
  font-size: 14px;
  cursor: pointer;
}
</style>